CN105508110A - Common-rail injector and sealing device thereof - Google Patents
Common-rail injector and sealing device thereof Download PDFInfo
- Publication number
- CN105508110A CN105508110A CN201610045039.4A CN201610045039A CN105508110A CN 105508110 A CN105508110 A CN 105508110A CN 201610045039 A CN201610045039 A CN 201610045039A CN 105508110 A CN105508110 A CN 105508110A
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- China
- Prior art keywords
- common
- seal ring
- rail injector
- ring
- sealing
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/166—Selection of particular materials
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a common-rail injector and a sealing device thereof. The sealing device comprises a sealing ring mounted in an annular cavity between an injector body and a control valve seat, wherein the sealing ring is made of polyether-ether-ketone materials, is assembled in the annular cavity in an interference manner, and can be matched with a support ring. The sealing device is simple in machining process, easy to assemble and reliable in sealing effect. The common-rail injector using the sealing device is good in durability and long in service life.
Description
Technical field
The present invention relates to engine fuel injection system, particularly relate to a kind of common-rail injector and seal arrangement thereof.
Background technique
For meeting the active demand of engine energy-saving environmental protection, the jet pressure of Common rail fuel injection system is being increased sharply.Under the driving of ultrahigh pressure, how effectively preventing fuel oil from namely realizing reliable sealing to the leakage of low pressure has become a major challenge that common-rail injector exploitation faces.
The sectional drawing in common common-rail injector control valve seat region as shown in Figure 1, 2.Based on the consideration of processing, assembly technology, the periphery 3A of the control valve seat 3 and inner headed face 5A of oil injector body 5 and inner cylinder 5C adopts Spielpassung, and matching gap is everlasting within 100 microns.This fitting surface top is high-voltage oil cavity 6, bottom is low pressure oil back chamber 4, for anti-high pressure fuel is to the leakage of low-pressure cavity, in matching gap, installs sealing unit.And being the working environment meeting common-rail injector high temperature, high pressure, sealing unit must possess following primary condition simultaneously: have enough large contact between sealing unit and matching trim, sealing unit itself must have enough compressive strength, can high temperature resistant, anti-extrusion, creep resistant.
At present, for the achievement of common-rail injector control valve seat skirt section sealing unit and patent documentation a lot.As mentioned the wedge-type seal circle adopting teflon in patent documentation CN100412353C.Teflon is very common in field of sealing technology, but teflon high temperature resistance, creep resisting ability are poor, and PTFE stuffing materials is very common along extrusion failure in blind.For the sealability of reinforced TFE, in teflon of being everlasting, fill a certain proportion of copper powder, because limitting by teflon ontological property, filling copper powder and being difficult to high temperature resistant, the creep-resistant property that significantly improve material; And the interpolation of copper powder makes the fragility of sealing material increase, tensility declines, and is easy to fracture.According to existing documents and materials, by the narrow limitation of existing plastic material, the briefing not having plastic seal ring to be used alone in the superhigh pressure sealing in common-rail injector skirt section.For solving sealing unit at high temperature, extrusion failure under ultrahigh pressure, generally need to increase supplementary structure, as patent documentation CN201206522Y and CN103899462A proposes the supporting ring structure of auxiliary seal unit supports respectively, as Fig. 1, shown in 2, sealing unit comprises seal ring 1 and support ring 2, seal ring 1 upper, under, left, right side is respectively 1A, 1D, 1B, 1C, support ring 2 is arranged on the step surface 5B of oil injector body 5, the lower end surface 1D of seal ring 1 contacts with the upper-end surface of support ring 2, this support ring 2 and seal ring 1 with the use of, the reliability of sealing increases.But support ring 2 needs the leakage way ensureing to have infiltrated the micro-fuel oil of seal ring 1 when designing, need process multiple oil unloading trough.Because oil sprayer support ring 2 size itself is very little, ensure to support makes processing technology complicated with the function of emptying simultaneously, because the assembly technology of support ring 2 on oil sprayer is complicated as described in patent documentation US6845756B2, yield rate is low, poor reliability, bring difficulty to batch production.
As can be seen here, above-mentioned existing sealing configuration in actual applications, obviously still has inconvenience and defect, and is urgently further improved.How to found a kind of processing technology simple, be easy to assembling, sealing effect is reliable, and the new common-rail injector seal arrangement of long perfomance life, becomes the target that current industry pole need be improved.
Summary of the invention
An object of the present invention is to provide a kind of seal arrangement of common-rail injector, make its processing technology simple, be easy to assembling, sealing effect is reliable, long perfomance life, thus the deficiency overcoming above-mentioned existing seal arrangement.
Another object of the present invention is to provide a kind of common-rail injector applying described seal arrangement, good endurance, long service life.
For achieving the above object, the present invention adopts following technological scheme:
A seal arrangement for common-rail injector, comprises the seal ring in the annular chamber for being arranged between oil injector body and control valve seat, and described seal ring adopts polyetheretherketonematerials materials to make, and for elastic conjunction in described annular chamber.
As improving further, inner side surface and the outer side surface of described seal ring are cylndrical surface, and the upper and lower end face of described seal ring is planar annular, V-type face or inclined-plane.
The magnitude of interference of described seal ring assembling is 50 microns to 300 microns.
The height of described seal ring is 2mm.
Described seal ring is processed by injection molding process.
The lower end surface of described seal ring is plane and directly contacts with described oil injector body step surface.
Also be provided with support ring bottom described seal ring, described support ring is located at bottom described annular housing, on oil injector body step surface.
A kind of common-rail injector, has described seal arrangement.
Owing to adopting technique scheme, the present invention at least has the following advantages:
(1) seal ring is used for the skirt section radial seal of common-rail injector control valve seat, material is excellent, structure is simple, its polyether-ether-ketone adopted is very suitable for the sealed environment of high temperature in oil sprayer, high pressure, as having good chemical stability, be applicable to fuel oil environment, there is good elasticity, be applicable to interference fit.
(2) in structure, seal ring is same is that cylndrical surface can ensure sealing effect by inner side surface 1B, outer side surface 1C that Sealing coordinates, simplified processing process and assembly manipulation; The end face 1A of seal ring and bottom surface 1D can make plane, V-type face or inclined-plane.
(3) seal ring can adopt molding and forming, and technique is simple, and product tolerance can be controlled within 0.05%.
(4) seal ring size is little, and sealing materials are few, and technique is simple, and overall cost is low.
(5) seal ring itself has self-supporting ability, can independently use, also can with various support ring with the use of, enhanced leaktightness effect.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is that common-rail injector controls valve pocket regional area sectional drawing.
Fig. 2 is common-rail injector control valve cover skirt section sealing area sectional drawing.
Fig. 3 is that the common-rail injector applying seal arrangement of the present invention controls valve pocket regional area sectional drawing.
Fig. 4 is the common-rail injector control valve cover skirt section sealing area sectional drawing applying seal arrangement of the present invention.
Fig. 5 is the structural representation of seal ring in the present invention.
Embodiment
Refer to shown in Fig. 3, for solving the high pressure sealing problem between common-rail injector control valve seat 3 skirt section and oil injector body 5, the present invention proposes the seal arrangement of a kind of reliable performance, good manufacturability.This device comprises the seal ring 1 in the annular chamber for being arranged between oil injector body 5 and control valve seat 3, described seal ring 1 adopts polyetheretherketonematerials materials to make, and for elastic conjunction in described annular chamber, thus effectively prevent the high pressure fuel lower portion low pressure oil back chamber 4 in top high-voltage oil cavity 6 from leaking.
Shown in Fig. 4,5, the above-mentioned polyether-ether-ketone seal ring 1 being applied to the sealing of common-rail injector control valve seat 3 skirt section, its inner side surface 1B and outer side surface 1C is all set to cylndrical surface, pass through elastic conjunction respectively with by control valve seat 3 cylindrical 3A, the oil injector body 5 inner cylinder 5C sealed, upper-end surface 1A, the lower end surface 1D of described seal ring 1 then can be set to planar annular, V-type face or inclined-plane etc., preferably, upper-end surface 1A, the lower end surface 1D of described seal ring 1 are planar annular, are easy to processing and assembling.
Said structure mainly utilizes the magnitude of interference of the plastic deformation of polyether-ether-ketone seal ring 1 and assembling to realize being sealed and matched assembling between face and compress.Apply in the oil sprayer working procedure of above-mentioned seal ring 1, the fuel pressure acting on seal ring 1 upper-end surface 1A transmits to the face that is sealed and matched, and sealing surface contact increases with by the increase of fuel pressure that seals, realizes the high pressure sealing in oil sprayer skirt section thus.Utilize material behavior and the resistance to high temperature of polyetheretherketonematerials materials excellence, seal ring 1 lower end surface 1D can directly directly contact with oil injector body 5 step surface 5B, realizes the self-supporting not with support ring, is namely used alone.By the larger situation in Sealing gap, also below seal ring 1 lower end surface 1D, various support ring can be set with use of working in coordination if occur.
When being applied to the sealing of common-rail injector control valve seat skirt section, above-mentioned seal arrangement of the present invention is implemented simple.Particularly, refer to shown in Fig. 2,3, implement in accordance with the following steps:
(1) according to the reference dimension of the physical dimension determination seal ring 1 of the cylindrical 3A of control valve seat 3, the inner cylinder 5C of oil injector body 5.
(2) based on gained reference dimension in 1, consider the inside and outside circle magnitude of interference of seal ring, this diameter magnitude of interference is often 50 microns to 300 microns, tries to achieve the free size of seal ring 1 fitting surface.The usual 2mm of short transverse of seal ring 1.
(3) based on the physical dimension of gained in upper step, adopt polyetheretherketonematerials materials, be processed into seal ring 1 with injection molding process.
(4) in oil sprayer, assemble described seal ring 1, utilize the magnitude of interference of the plastic deformation of polyether-ether-ketone seal ring 1 and assembling to realize being sealed and matched assembling between face and compress.Wherein, the inner side surface 1B of seal ring 1, outer side surface 1C is cylndrical surface, passes through elastic conjunction respectively with by control valve seat 3 cylindrical 3A, the oil injector body 5 inner cylinder 5C sealed.
(5) utilize material behavior and the resistance to high temperature of polyetheretherketonematerials materials excellence, seal ring 1 lower end surface 1D can directly directly contact with oil injector body 5 step surface 5B, realizes the self-supporting not with support ring.When seal ring 1 lower end surface 1D directly contacts with oil injector body 5 step surface 5B, preferred planar contacts, and namely seal ring 1 lower end surface 1D is planar annular, but also can beveling structure.If occur by the larger situation in Sealing gap, seal ring 1 lower end surface 1D can with various support ring with the use of.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (8)
1. a seal arrangement for common-rail injector, comprising the seal ring in the annular chamber for being arranged between oil injector body and control valve seat, it is characterized in that, described seal ring adopts polyetheretherketonematerials materials to make, and for elastic conjunction in described annular chamber.
2. the seal arrangement of a kind of common-rail injector according to claim 1, is characterized in that, inner side surface and the outer side surface of described seal ring are cylndrical surface, and the upper and lower end face of described seal ring is planar annular, V-type face or inclined-plane.
3. the seal arrangement of a kind of common-rail injector according to claim 1, is characterized in that, the magnitude of interference of described seal ring assembling is 50 microns to 300 microns.
4. the seal arrangement of a kind of common-rail injector according to claim 1, is characterized in that, the height of described seal ring is 2mm.
5. the seal arrangement of a kind of common-rail injector according to claim 1, is characterized in that, described seal ring is processed by injection molding process.
6. the seal arrangement of a kind of common-rail injector according to any one of claim 1-5, is characterized in that, the lower end surface of described seal ring is plane and directly contacts with described oil injector body step surface.
7. the seal arrangement of a kind of common-rail injector according to any one of claim 1-5, is characterized in that, is also provided with support ring bottom described seal ring, and described support ring is located at bottom described annular housing, on oil injector body step surface.
8. a common-rail injector, is characterized in that, has the seal arrangement according to any one of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045039.4A CN105508110A (en) | 2016-01-22 | 2016-01-22 | Common-rail injector and sealing device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045039.4A CN105508110A (en) | 2016-01-22 | 2016-01-22 | Common-rail injector and sealing device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105508110A true CN105508110A (en) | 2016-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610045039.4A Pending CN105508110A (en) | 2016-01-22 | 2016-01-22 | Common-rail injector and sealing device thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07293387A (en) * | 1994-04-21 | 1995-11-07 | Elasis Sistema Ric Fiat Nel Mezzogiorno Soc Consortile Per Azioni | Electromagnetic fuel injection valve |
| EP1574702A1 (en) * | 2004-03-11 | 2005-09-14 | Delphi Technologies, Inc. | A method of assembling a fuel injector |
| CN101358570A (en) * | 2007-07-30 | 2009-02-04 | C·R·F·索奇埃塔·孔索尔蒂莱·佩尔·阿齐奥尼 | Fuel injector with balanced metering servovalve, for an internal combustion engine |
| CN201206522Y (en) * | 2008-06-05 | 2009-03-11 | 湖南奔腾动力科技有限公司 | Plunger piston sleeve sealing arrangement controlled by fuel injector of common rail fuel injection system |
| CN205330854U (en) * | 2016-01-22 | 2016-06-22 | 北京亚新科天纬油泵油嘴股份有限公司 | Common rail injector and sealing device thereof |
-
2016
- 2016-01-22 CN CN201610045039.4A patent/CN105508110A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07293387A (en) * | 1994-04-21 | 1995-11-07 | Elasis Sistema Ric Fiat Nel Mezzogiorno Soc Consortile Per Azioni | Electromagnetic fuel injection valve |
| EP1574702A1 (en) * | 2004-03-11 | 2005-09-14 | Delphi Technologies, Inc. | A method of assembling a fuel injector |
| CN101358570A (en) * | 2007-07-30 | 2009-02-04 | C·R·F·索奇埃塔·孔索尔蒂莱·佩尔·阿齐奥尼 | Fuel injector with balanced metering servovalve, for an internal combustion engine |
| CN201206522Y (en) * | 2008-06-05 | 2009-03-11 | 湖南奔腾动力科技有限公司 | Plunger piston sleeve sealing arrangement controlled by fuel injector of common rail fuel injection system |
| CN205330854U (en) * | 2016-01-22 | 2016-06-22 | 北京亚新科天纬油泵油嘴股份有限公司 | Common rail injector and sealing device thereof |
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Application publication date: 20160420 |